* {
    margin: 0;
    padding: 0;
}
body {
    height: 100vh;
    overflow: hidden;
    background: #000;
    display: flex;
    justify-content: center;
    align-items: center;
}
.map {
    width: 747px;
    height: 616px;
    background: url(../img/map.png) no-repeat;
    position: absolute;
}
.city {
    position: absolute;
    right: 190px;
    top: 228px;
}
.tb {
    right: 76px;
    top: 497px;
}
.gz {
    right: 189px;
    top: 542px;
}
.dotted {
    width: 8px;
    height: 8px;
    background-color: #0099ff;
    border-radius: 50%;
}
.city div[class*="pulse"] {
    position: absolute;
    top: 50%;
    left: 50%;
    /* 保证在盒子的水平垂直居中 */
    transform: translate(-50%,-50%);
    width: 8px;
    height: 8px;
    box-shadow: 0 0 12px #009dfd;
    border-radius: 50%;
    animation: pulse 1.2s linear infinite;
}
.city div.pulse2 {
    animation-delay: 0.4s;
}
.city div.pulse3 {
    animation-delay: 0.8s;
}
@keyframes pulse {
    0% {

    }
    70% {
        /* 不用放大scale是因为放大的时候阴影会放大 */
        width: 40px;
        height: 40px;
        opacity: 1;
    }
    100% {
        width: 70px;
        height: 70px;
        opacity: 0;
    }
}